Effect of variation of environmental conditions on the microbial communities of deep-sea vent chimneys, cultured in a bioreactor

Type Article
Date 2009-07
Language English
Author(s) Byrne Nathalie1, Lesongeur Francoise1, Bienvenu Nadege1, Geslin Claire1, Alain Karine1, Prieur Daniel1, Godfroy AnneORCID1
Affiliation(s) 1 : IFREMER, Ctr Brest, Lab Microbiol Environm Extremes, UMR6197, F-29280 Plouzane, France.
Source Extremophiles (1431-0651) (Springer), 2009-07 , Vol. 13 , N. 4 , P. 595-608
DOI 10.1007/s00792-009-0242-6
WOS© Times Cited 8
Keyword(s) 16S rRNA genes, Oligotrophic condition, Environmental condition, Bioreactor, Continuous enrichment culture, Microbial diversity, Deep sea hydrothermal vent
Abstract Both cultivation and molecular techniques were used to investigate the microbial diversity and dynamic of a deep-sea vent chimney. The enrichment cultures performed in a gas-lift bioreactor were inoculated with a black smoker chimney sample collected on TAG site on the mid-Atlantic ridge. To mimic as close as possible environmental conditions, the cultures were performed in oligotrophic medium with nitrogen, hydrogen and carbon dioxide (N-2/H-2/CO2) gas sweeping. Also, the temperature was first settled at a temperature of 85A degrees C and colloidal sulphur was added. Then, the temperature was lowered to 60A degrees C and sulphur was omitted. Archaeal and bacterial diversity was studied in both culture and natural samples. Through 16S rRNA gene sequences analysis of the enrichment cultures microorganisms affiliated to Archeoglobales, Thermococcales were detected in both conditions while, Deferribacterales and Thermales were detected only at 65A degrees C in the absence of sulphur. Single-stranded conformational polymorphism and quantitative PCR permit to study the microbial community dynamic during the two enrichment cultures. The effect of environmental changes (modification of culture conditions), i.e. temperature, medium composition, electron donors and acceptors availability were shown to affect the microbial community in culture, as this would happen in their environment. The effect of environmental changes, i.e. temperature and medium composition was shown to affect the microbial community in culture, as this could happen in their environment. The modification of culture conditions, such as temperature, organic matter concentration, electron donors and acceptors availability allowed to enrich different population of prokaryotes inhabiting hydrothermal chimneys.
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Byrne Nathalie, Lesongeur Francoise, Bienvenu Nadege, Geslin Claire, Alain Karine, Prieur Daniel, Godfroy Anne (2009). Effect of variation of environmental conditions on the microbial communities of deep-sea vent chimneys, cultured in a bioreactor. Extremophiles, 13(4), 595-608. Publisher's official version : https://doi.org/10.1007/s00792-009-0242-6 , Open Access version : https://archimer.ifremer.fr/doc/00000/6920/